4 white lights in large square shape with 3 redlights in line in middle approx. 100 feet long

Last night , my wife saw strange lights , yelled at me to come upstairs to look at this object. The object was coming out of the north traveling due south at approx. 2000 feet. The object appeared to traveling maybe 60mph. slow..it flew directly over our position , we ran outside and watched it travel directly overhead.. i could hear a very faint low rumble. The lighting configuration was unlike anything ive seen before . Down the middle of object appeared 3 red lights spaced out in line,surrounding the lights were 4 white lights in large square , all blinking. The object was large around 100 feet long , couldnt make out outline of craft.. because of unusual light configuration ,wasnt triangle. It appeared to be flying square, or possibly a capital I shape., very strange.